Besides Arabia Felix, he wrote several other books, including The Arabs: The Epic Life Story of a People Who Have Left Their Deep Impress on the World (London: T. Butterworth, 1930; Garden City, New York: Doubleday, Doran and Co., Inc., 1937).

A recent film called 'Crossing the Empty Quarter' was created by the Anglo-Oman Society's Chairman, Richard Muir — the ex-Ambassador to Oman — from footage taken by Thomas on his journey, and photographs from the Library of the Oriental Institute in Cambridge.[5]

He returned to England and died in the house in which he was born (or possibly in Cairo), in 1950.